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<A href="introduction6.htm">Debugging Tools for Windows (WinDbg, KD, CDB, NTSD)</A> &gt; <A href="debugger_reference.htm">Debugger Reference</A> &gt; <A href="debugger_commands.htm">Debugger Commands</A> &gt; <A href="commands.htm">Commands</A> &gt; </div>
	<div id="winchm_template_title">f, fp (Fill Memory)</div>
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	<div id="winchm_template_content"><div id="mainSection"><p>The <b>f</b> and <b>fp</b> commands fill the specified memory range with a repeating pattern.</p>
<p>These commands should not be confused with the <a href="#Bookmark1964"><b>~F (Freeze Thread)</b></a> command.</p>
<pre class="syntax">f Range Pattern 
fp [MemoryType] PhysicalRange Pattern</pre>
<h2><a id="ddk_cmd_fill_memory_dbg"></a><a id="DDK_CMD_FILL_MEMORY_DBG"></a>Parameters</h2>
<p></p>
<dl>
<dt><a id="_______Range______"></a><a id="_______range______"></a><a id="_______RANGE______"></a>       <i>Range</i>      </dt>
<dd>
<p>Specifies the range in virtual memory to fill. For more syntax details, see <a href="#Bookmark1927">Address and Address Range Syntax</a>.</p>
</dd>
<dt><a id="_______PhysicalRange______"></a><a id="_______physicalrange______"></a><a id="_______PHYSICALRANGE______"></a>       <i>PhysicalRange</i>      </dt>
<dd>
<p>(Kernel mode only)  Specifies the range in physical memory to fill. The syntax of <i>PhysicalRange</i> is the same as that of a virtual memory range, except that no symbol names are permitted.</p>
</dd>
<dt><a id="_______MemoryType______"></a><a id="_______memorytype______"></a><a id="_______MEMORYTYPE______"></a>       <i>MemoryType</i>      </dt>
<dd>
<p>(Kernel mode only) Specifies the type of physical memory, which can be one of the following:</p>
<p></p>
<dl>
<dt><a id="_c_"></a><a id="_C_"></a><b>[c]</b></dt>
<dd>
<p>Cached memory.</p>
</dd>
<dt><a id="_uc_"></a><a id="_UC_"></a><b>[uc]</b></dt>
<dd>
<p>Uncached memory.</p>
</dd>
<dt><a id="_wc_"></a><a id="_WC_"></a><b>[wc]</b></dt>
<dd>
<p>Write-combined memory.</p>
</dd>
</dl>
</dd>
<dt><a id="_______Pattern______"></a><a id="_______pattern______"></a><a id="_______PATTERN______"></a>       <i>Pattern</i>      </dt>
<dd>
<p>Specifies one or more byte values with which to fill memory.</p>
</dd>
</dl>
<h3><a id="Environment"></a><a id="environment"></a><a id="ENVIRONMENT"></a>Environment</h3>
<table>
<tr>
<td>
<p><b>Modes</b></p>
</td>
<td>
<p>
<dl>
<dt><b>f:</b> user mode, kernel mode</dt>
<dt><b>fp:</b> kernel mode only</dt>
</dl>
</p>
</td>
</tr>
<tr>
<td>
<p><b>Targets</b></p>
</td>
<td>
<p>live, crash dump</p>
</td>
</tr>
<tr>
<td>
<p><b>Platforms</b></p>
</td>
<td>
<p>all </p>
</td>
</tr>
</table>
<p> </p>
<h3><a id="Additional_Information"></a><a id="additional_information"></a><a id="ADDITIONAL_INFORMATION"></a>Additional Information</h3>
<p>For an overview of memory manipulation and a description of other memory-related commands, see <a href="#Bookmark1360">Reading and Writing Memory</a>.</p>
<h2>Remarks</h2>
<p>This command fills the memory area specified by <i>range</i> with the specified <i>pattern</i>, repeated as many times as necessary.</p>
<p></p>
<p>The <i>pattern</i> parameter must be input as a series of bytes. These can be entered as numeric or as ASCII characters.</p>
<p>Numeric values will be interpreted as numbers in the current radix (16, 10, or 8). To change the default radix, use the <a href="#Bookmark2015"><b>n (Set Number Base)</b></a> command. The default radix can be overridden by specifying the <b>0x</b> prefix (hexadecimal), the <b>0n</b> prefix (decimal), the <b>0t</b> prefix (octal), or the <b>0y</b> prefix (binary).</p>
<div class="alert"><b>Note</b>    The default radix behaves differently when C++ expressions are being used. For more information, see the <a href="#Bookmark1266">Evaluating Expressions</a> topic.</div>
<div> </div>
<p>If ASCII characters are used, each character must be enclosed in single straight quotation marks. C-style escape characters (such as '\0' or '\n') may not be used. </p>
<p>If multiple bytes are specified, they must be separated by spaces.</p>
<p>If <i>pattern</i> has more values than the number of bytes in the range, the debugger ignores the extra values.</p>
<p>Here are some examples. Assuming the current radix is 16, the following command will fill memory locations 0012FF40 through 0012FF5F with the pattern "ABC", repeated several times:</p>
<pre class="syntax" xml:space="preserve"><code>0:000&gt; f 0012ff40 L20 'A' 'B' 'C'</code></pre>
<p>The following command has the exact same effect:</p>
<pre class="syntax" xml:space="preserve"><code>0:000&gt; f 0012ff40 L20 41 42 43</code></pre>
<p>The following examples show how you can use the physical memory types (<b>c</b>, <b>uc</b>, and <b>wc</b>) with the <b>fp</b> command in kernel mode:</p>
<pre class="syntax" xml:space="preserve"><code>kd&gt; fp [c] 0012ff40 L20 'A' 'B' 'C'</code></pre>
<pre class="syntax" xml:space="preserve"><code>kd&gt; fp [uc] 0012ff40 L20 'A' 'B' 'C'</code></pre>
<pre class="syntax" xml:space="preserve"><code>kd&gt; fp [wc] 0012ff40 L20 'A' 'B' 'C'</code></pre></div></div>	
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